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2015 8th International Conference on Biomedical Engineering and Informatics (BMEI)最新文献

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The effects of head parameters on the specific absorption rate in the human head 头部参数对人体头部比吸收率的影响
Pub Date : 2015-10-01 DOI: 10.1109/BMEI.2015.7401542
Changqi Zhu, Dongsheng Wu, Lanlan Ping, Wenli Liang
The human head model is constructed with the help of the High Frequency Structure Simulator (HFSS) software in this paper. The distributions of the specific absorption rate (SAR) in the human head are studied, and then, the influence of the head model dimensions and electrical parameters are discussed. The results show that the absorption of the electromagnetic radiation in the human head is mainly concentrated on the skin and brain tissue, the skull layer absorption is very little. The SAR in the skull and brain tissue increases along with the decreases of the model dimensions. The SAR in the skin increases along with the increase of the electrical parameters. The trends of SAR are more obvious when the head dimensions and electrical parameters were changed at the same time.
本文利用高频结构模拟器(HFSS)软件建立了人体头部模型。研究了人体头部的比吸收率(SAR)分布,并讨论了头部模型尺寸和电学参数的影响。结果表明,电磁辐射在人体头部的吸收主要集中在皮肤和脑组织,颅骨层吸收很少。颅骨和脑组织的SAR随模型尺寸的减小而增大。皮肤的SAR随电参数的增加而增加。当封头尺寸和电参数同时变化时,SAR的变化趋势更为明显。
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引用次数: 4
An HTML5 based discoloration algorithm for people with low vision 一个基于HTML5的低视力人群变色算法
Pub Date : 2015-10-01 DOI: 10.1109/BMEI.2015.7401619
Fanghua Yan, Guoqiang Liu, Yayu Zheng
With the rapid development of Internet, web information is being more and more colorful. However, mixed color information makes people with low vision see webpage unclearly when they surf the Internet. For people with low vision cannot distinguish so many colors, enhancing the contrast between text or image and background is considered as the most effective way to improve this situation. Based on people with low vision's perception of difference between different colors, this paper designs a webpage discoloration algorithm based on HTML5. The algorithm produces a visual effect by adjusting the text and background colors, as well as the colors in images to the range that people with low vision can identify. Text discoloration is completed by adjusting the text style properties. OTSU algorithm based on block segmentation algorithm implements image discoloration, through the way of pixel point to point, applies look-up table method to transform color of the original image into a typical color. The result shows that the algorithm is able to realize webpage discoloration effects, enhance the contrast of the webpage and better meet the needs of people with low vision browsing webpage.
随着互联网的飞速发展,网络上的信息越来越丰富多彩。然而,混合颜色的信息会使视力低下的人在上网时看不清网页。对于视力低下的人来说,无法区分这么多的颜色,增强文本或图像与背景的对比度被认为是改善这种情况的最有效的方法。本文基于弱视人群对不同颜色差异的感知,设计了一种基于HTML5的网页变色算法。该算法通过调整文本和背景颜色以及图像中的颜色来产生视觉效果,使其达到视力低下的人可以识别的范围。文本变色是通过调整文本样式属性完成的。基于块分割算法的OTSU算法实现图像变色,通过像素点对点的方式,应用查表法将原始图像的颜色转换为典型颜色。结果表明,该算法能够实现网页变色效果,增强网页对比度,更好地满足弱视人群浏览网页的需求。
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引用次数: 2
Ultrasound harmonic imaging with reducing speckle noise by an interlaced iterative frequency compounding approach 用交错迭代频率复合方法降低散斑噪声的超声谐波成像
Pub Date : 2015-10-01 DOI: 10.1109/BMEI.2015.7401469
Wei Guo, Yuanyuan Wang, Jinhua Yu
Speckle noise is a phenomenon inherent in any coherent imaging system and decreases the signal-to-noise ratio (SNR), which brings down the imaging quality. Speckle noise reduction is particularly important in the tissue harmonic imaging (THI) since it has the lower energy and the poorer SNR than the fundamental imaging (FI). Speckle can be reduced by frequency compounding (FC), which means incoherently averaging the images with different speckle patterns acquired by changing the center frequency of the pulse. As for the THI, the difference in the emission spectrum doubles when using the FC. In this paper, we propose an interlaced iterative frequency compounding (IIFC) method with the pulse inversion (PI) technique. The new method brings a good speckle suppression performance while the high frame rate is retained. To illustrate the performance of our method, experiments have been conducted on the simulated data. A nonlinear simulation platform based on the full-wave model is used in the harmonic imaging simulation. Results show that our method brings the SNR an improvement of up to 22% in comparison with the single frame THI while maintaining a far better performance in both terms of resolution and contrast than the FI. We also demonstrate that our method for THI retains the high frame rate although using PI.
散斑噪声是任何相干成像系统所固有的一种现象,它降低了相干成像系统的信噪比,降低了成像质量。由于组织谐波成像(THI)比基波成像(FI)具有更低的能量和更差的信噪比,因此散斑噪声的抑制在组织谐波成像(THI)中尤为重要。利用频率复合(FC)技术,通过改变脉冲的中心频率,对具有不同散斑模式的图像进行非相干平均,可以有效地降低散斑。对于THI,当使用FC时,发射光谱的差异增加了一倍。本文提出了一种结合脉冲反演技术的交错迭代频率复合(IIFC)方法。该方法在保持高帧率的同时,具有良好的散斑抑制性能。为了说明我们的方法的性能,在模拟数据上进行了实验。谐波成像仿真采用基于全波模型的非线性仿真平台。结果表明,与单帧THI相比,我们的方法使信噪比提高了22%,同时在分辨率和对比度方面都比FI保持了更好的性能。我们还证明了我们的THI方法虽然使用PI,但仍然保持高帧率。
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引用次数: 1
Inter-level and intra-level deconvolution based image deblurring algorithm for wide field microscopy 基于层间和层内反卷积的宽视场显微图像去模糊算法
Pub Date : 2015-10-01 DOI: 10.1109/BMEI.2015.7401479
Yanzhi Ding, I. Park, X. Cui, Van Huan Nguyen, Hakil Kim, T. Do, Wei Li
This paper proposes an inter-level and intra-level deconvolution based image deblurring algorithm (ILILD) for microscopic images. Pyramid structure is used, and inter-level deconvolution is applied to estimate latent image from coarse level to fine level. The inter-level algorithm is based on total variation regularized Richardson-Lucy scheme, which can estimate latent image with artifacts suppressed. After inter-level deconvolution, intra-level deconvolution is applied. In each pyramid level of image, the residual deconvolution is done as the intra-level deconvolution scheme to recover image edges and details furtherly. Experiments show that ILILD algorithm can estimate latent images in less time and the results have better peak signal to noise ratio, higher image entropies and few artifacts.
提出了一种基于层间和层内反卷积的显微图像去模糊算法。利用金字塔结构,利用层间反褶积对粗到细的潜在图像进行估计。层次间算法基于全变分正则化Richardson-Lucy方案,能够在抑制伪影的情况下估计潜在图像。在层间反褶积之后,再进行层内反褶积。在图像的每个金字塔层中,残差反卷积作为层内反卷积方案,进一步恢复图像的边缘和细节。实验表明,ILILD算法可以在较短的时间内估计出潜在图像,结果具有较好的峰值信噪比、较高的图像熵和较少的伪影。
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引用次数: 2
Segmentation of arteriovenous malformations nidus and vessel in digital subtraction angiography images based on an iterative thresholding method 基于迭代阈值法的数字减影血管造影图像中动静脉畸形病灶和血管的分割
Pub Date : 2015-10-01 DOI: 10.1109/BMEI.2015.7401483
Yuxi Lian, Yuanyuan Wang, Jinhua Yu, Yi Guo, Liang Chen
Digital subtraction angiography (DSA) plays an important role in the diagnosis and therapy of vascular diseases. Segmentation of nidus and vessel in DSA images is an essential step in the diagnosis of arteriovenous malformations (AVM). In this paper, a novel segmentation method based on the global and iterative local thresholding is proposed to segment the nidus and vessel in DSA images. Firstly, the original image is divided into proper subimages. For each subimage, Ostu's method is primarily used and pixels are classified into two groups by the threshold. Then, according to the variance of the subimage intensities, the mean or median values of two groups are calculated to sort the pixels into three classes. These three classes represent the dark AVM and vessel, the bright background and undetermined regions in the original DSA image. The first two classes are determined directly and will not be processed further. The undetermined regions are processed in the next iteration to segment tiny vessels until the thresholds between two iterations are less than a preset one. Finally, all classes are combined to create the segmentation result. We test this method on DSA images of the AVM. Experimental results show that the proposed method performs better than the other state-of-the-art methods in the segmentation of DSA images. The proposed method can identify fine and tiny vessel structures, as well as distinguish large AVM nidus in one framework.
数字减影血管造影(DSA)在血管疾病的诊断和治疗中发挥着重要作用。DSA图像中病灶和血管的分割是诊断动静脉畸形(AVM)的重要步骤。本文提出了一种基于全局和迭代局部阈值分割的DSA图像病灶和血管分割方法。首先,将原始图像分割成适当的子图像。对于每个子图像,主要使用Ostu的方法,并通过阈值将像素分为两组。然后,根据子图像强度的方差,计算两组像素的均值或中值,将像素分为三类。这三类分别代表原始DSA图像中的暗AVM和血管、亮背景和未确定区域。前两个类是直接确定的,不会被进一步处理。在下一次迭代中处理未确定的区域以分割微血管,直到两次迭代之间的阈值小于预设的阈值。最后,将所有类组合在一起创建分割结果。我们在AVM的DSA图像上测试了该方法。实验结果表明,该方法对DSA图像的分割效果优于现有的分割方法。该方法既能识别细小血管结构,又能在同一框架内识别较大的AVM病灶。
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引用次数: 5
A new method based on hough transform for quick line and circle detection 一种基于霍夫变换的直线和圆快速检测新方法
Pub Date : 2015-10-01 DOI: 10.1109/BMEI.2015.7401472
Huashan Ye, G. Shang, Lina Wang, Min Zheng
Hough transform (HT) is a typical method to detect or segment geometry objects from images. In this paper, we study the principle of Hough Transform and its mathematical expressions, and try to use a new approach based on Hough transform for quick line and circle detection in image processing. Our method accurately detected some simple graphics, such as straight line of different direction, circles of different detection, thickness and different number. The results show that our method is less memory consumption and calculated fast, which could be applied for line detection and segmentation in 3D ultrasonic image.
霍夫变换(Hough transform, HT)是从图像中检测或分割几何目标的一种典型方法。本文研究了霍夫变换的基本原理及其数学表达式,并尝试了一种基于霍夫变换的图像快速线圆检测方法。我们的方法可以准确地检测出一些简单的图形,如不同方向的直线、不同检测的圆、不同厚度和不同数量。实验结果表明,该方法占用内存少,计算速度快,可用于三维超声图像的直线检测和分割。
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引用次数: 43
Test of label-free Nasopharyngeal carinoma tissue at different stages by Raman spectroscopy 拉曼光谱法检测不同阶段无标记鼻咽癌组织
Pub Date : 2015-10-01 DOI: 10.1109/BMEI.2015.7401505
Mingyu Liu, S. Qiu, Jinyong Lin, Weilin Wu, Guannan Chen, Rong Chen
Raman spectroscopy (RS) of Nasopharyngeal carcinoma (NPC) tissue contained various biomedicine features. These features indicated molecular-level information of tissue at different carcinoma development-level. This study suggested an automatic and quick method for the NPC Raman spectra classification at different stages by multivariate statistical analysis. In the RS measurement, high quality Raman spectra was acquired from each NPC tissue sample in two groups: one group consisted of 30 NPC patients at the early stages (I-II), another group was 46 NPC patients at the advanced stages (III-IV). Moreover, tentative diagnostic algorithms based on principle components analysis (PCA) and support vector machine (SVM) were employed to classify the multivariate data of Raman spectra effectively. The classification performance (sensitivities and specificities were 70% (21/30) and 91% (42/46)) was achieved by the PCA-SVM in conjunction with leave-one-out cross validation method. In this beneficial study, the RS technique in conjunction with PCA-SVM provided a great clinical potential for rapid NPC stage diagnosis.
鼻咽癌组织的拉曼光谱(RS)具有多种生物医学特征。这些特征提示了不同肿瘤发展水平组织的分子水平信息。本研究提出了一种基于多元统计分析的不同阶段NPC拉曼光谱自动快速分类方法。RS测量中,从两组鼻咽癌组织样本中获得高质量的拉曼光谱:一组包括30例早期(I-II)鼻咽癌患者,另一组包括46例晚期(III-IV)鼻咽癌患者。此外,采用基于主成分分析(PCA)和支持向量机(SVM)的初步诊断算法对拉曼光谱的多变量数据进行有效分类。PCA-SVM结合留一交叉验证方法的分类性能达到了70%(21/30)和91%(42/46)。在这项有益的研究中,RS技术结合PCA-SVM为快速鼻咽癌分期诊断提供了巨大的临床潜力。
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引用次数: 0
Energy-balanced clustering routing protocol based on task separation in wireless sensor networks 无线传感器网络中基于任务分离的能量均衡聚类路由协议
Pub Date : 2015-10-01 DOI: 10.1109/BMEI.2015.7401608
Wei Sun, Xiaoying Song, Fasheng Wang
Clustering protocol for data gathering is one of the effective ways to solve the energy hole problem in wireless sensor networks. However, most of the existing clustering protocols focus on the network model with uniform node distribution. They cannot effectively apply to the real network where the sensor nodes are randomly non-uniformly deployed. In this paper, we propose an energy-balanced clustering routing protocol (EBCRP) based on task separation. In this scheme, the network is firstly divided into clusters by using global information. And each of them has the same number of sensor nodes in order to balance the energy consumption of intra-cluster. In succession, task separation, the tasks of traditional single cluster head are separated and achieved by two cluster heads respectively, is proposed to reduce the traffic burden for single cluster head. Then, we explore an energy-efficient and reliable inter-cluster routing algorithm, which considers comprehensively three factors: residual energy, distance and available buffer space of nodes. Simulation results and performance evaluation of EBCRP show significant improvement in network lifetime and energy balance.
数据采集的聚类协议是解决无线传感器网络中能量空洞问题的有效方法之一。然而,现有的聚类协议大多侧重于节点均匀分布的网络模型。它们不能有效地应用于传感器节点随机非均匀分布的实际网络。本文提出了一种基于任务分离的能量均衡聚类路由协议(EBCRP)。该方案首先利用全局信息将网络划分为簇;为了平衡集群内的能量消耗,每个集群都有相同数量的传感器节点。接着,提出了任务分离,将传统的单簇头任务分别由两个簇头分离完成,以减轻单簇头的流量负担。在此基础上,综合考虑节点剩余能量、节点距离和节点可用缓冲空间三个因素,提出了一种高效可靠的集群间路由算法。仿真结果和性能评估表明,EBCRP在网络寿命和能量平衡方面有显著改善。
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引用次数: 5
Design and implementation of the anesthesia machine monitoring system 麻醉机监控系统的设计与实现
Pub Date : 2015-10-01 DOI: 10.1109/BMEI.2015.7401615
Ming Huang, Zhenjuan Zhang
An intellectual non-invasive anesthesia machine monitoring system is analyzed in this paper. The system consists of a data acquisition terminal, a communication module and a PC/104 monitoring platform. The data acquisition terminal detects the real-time parameters including tidal flow, airway pressure and oxygen concentration. These parameters will be transmitted to the monitoring platform through serial ports for records and analysis. In this way, the flow, pressure and concentration of the medicine can be controlled for the general anesthesia on the patient. With advantages of intuitive alarm signals, safe and reliable environment, and complete function, the system also realizes the expert diagnosis by XMLHttpRequest and Server-Sent Events technology. After repeated validation test, the system can work steadily and will have a wide application prospect in the market.
介绍了一种智能无创麻醉机监控系统。该系统由数据采集终端、通信模块和PC/104监控平台组成。数据采集终端实时检测潮汐流量、气道压力、氧气浓度等参数。这些参数将通过串口传输到监控平台进行记录和分析。这样,在对病人进行全身麻醉时,就可以控制药物的流量、压力和浓度。该系统具有报警信号直观、环境安全可靠、功能完备等优点,并通过XMLHttpRequest和Server-Sent Events技术实现专家诊断。经过多次验证测试,该系统工作稳定,具有广阔的市场应用前景。
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引用次数: 0
A three-dimensional positioning system based on RSSI for the wireless sensor network 基于RSSI的无线传感器网络三维定位系统
Pub Date : 2015-10-01 DOI: 10.1109/BMEI.2015.7401606
Shan Liu, Fang Wang, Jianping Chai
With the popularity of smart phones and the rapid development of wireless communication technologies, people tend to determine their indoor location in the complex indoor environment such as a library, exhibition hall and shopping malls using location-based services. However, in many scenarios, two-dimensional positioning system has been unable to meet the needs. In this paper, we research on the three-dimensional positioning system using location fingerprinting techniques, improve the algorithm based on K Nearest Neighborhood, and establish the three-dimensional positioning system. The results showed that our simulation model can achieve a more accurate result than two-dimensional models.
随着智能手机的普及和无线通信技术的飞速发展,在图书馆、展览馆、商场等复杂的室内环境中,人们倾向于使用基于位置的服务来确定自己的室内位置。然而,在很多场景下,二维定位系统已经无法满足需求。本文对基于位置指纹技术的三维定位系统进行了研究,对基于K近邻的三维定位算法进行了改进,建立了三维定位系统。结果表明,与二维模型相比,我们的仿真模型可以获得更精确的结果。
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引用次数: 1
期刊
2015 8th International Conference on Biomedical Engineering and Informatics (BMEI)
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